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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1864bb5f674421d3b6128ae2f9e59ec2f4b82e1530954e4b02ef3336b1c9cf03' 
  AND token = '4uD/7tcmO/PNJ3a36ySqXMmGLYUsJmwpFKCQy+sECTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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