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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd39fd3b8da4b56e6f38ef4a47198a922310c65ec08b0e200f000869c6088ebbd' 
  AND token = 'RzhMJa/ge9VwKsak0QNlJNBKXM6EGi3ZsZIImuCNaSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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