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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c173caf5f52458968a7b007ed8f5f446c0ecc58efd4068894ecb41f8a92fb4de' 
  AND token = '5HujP78T00VUMrLbiHrr3UAZa91Rg+rvVY74iesfZ/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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