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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbfec8f49f96cfdae4d0addb4eb24bca472b2070c87d954fdd4c41ba1a6d5459' 
  AND token = 'cM4ZdmzEa3aEcQKESf/QuMxOJYCzJ83DLjmLdq5QEvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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