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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'febb13d76b2dbe6bbb1768ea31d447ba6cda1fc118fccb4c1ca3dd2f0573d102' 
  AND token = 'C9D1UjlBLRQU6nUw2Gq6I4n+uoy+jRw4tJnGF0J0EXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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