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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908c971c537c04826ed1453b1f3deea74e2b2488ec1b56fb89b0e03421b6bf94' 
  AND token = 'Xxhmwq07+VSq4Dj+nn1zNaEJf/SlVo0aueTx/+4zBxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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