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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa7a2a29067e37c4488b92de6c07e2c0dcb3e996f3662791c3abea7ad47c76eb' 
  AND token = 'A35/R7iOPGjPWzxPOp9lWfq/3YfW7akOXvyn5OTLiYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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