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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac7b8816c7863736173664ccfac8039ba112a706850ebbd613f2493d572b299' 
  AND token = 'eFHgtpQODsY3igeMmzJP6QokgtGfoEJumyfJ10ADiRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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