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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb5f6b808671967f73e3f93ebc7fc514ce401ba3f35ee01738d1ebbbfbd5768d' 
  AND token = 'CBVeimhsSutoYQIzITmG2LDo4Feg/RoMLOwrXQ/a0jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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