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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3b7340226de7e68a66f35195260b4f7d62bf1c561759bf101540404eb06247' 
  AND token = '/sak2WU/NxDgvHKdnhJv2Mv0AINkpQ54bA6LRzeTmI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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