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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd8da9d4a1c914268982f7d47f8eabd9f5db833a6d8f99407a8e05983248fe8' 
  AND token = 'xAEzbxzGbXWh/UxL3n9Lz87oMxoN2uzKbSDPast3NDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}