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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b115b1f92cf8bc9a6b9b491eb279eadddd53e54ac0cdeda99238ec011560104d' 
  AND token = '5y7fZUyUaDcpzl6HE3qpS7s1V68ndWFslTpxyH54tlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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