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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56fac9d067b7ac197d6b3c9b7a942ed84e5b9a411c77a0fbb26642207cc1ab6c' 
  AND token = 'jxBKEqUyc2bQXCpO7IfgE3GKi7aIiZu7vdti0Oylk3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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