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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '843c148c9a0e8d2f00ec4fe2f62de2a70927581239fcb356e1e356590174159f' 
  AND token = 'UtEUbvsIyg57ak40tf+Va5yvx4dPuyksHhx8tsJ+cdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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