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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f3ea4dacc6d3e7c0f5f786395faa8902b79c1c97843bf1a2bcf608aa6819acd' 
  AND token = 'k5T79eL+jLaTKv74rqWeuCNC8tMMqdhh1xrqCteW8vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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