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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '412d55837bbf07a79a430e8de25a6bf0b3dd824a5c9e55b4499e479e59c34e04' 
  AND token = 'm499lJf1V5sJT8GRix0Y7Nh6mImxtDXxGQTc1767K7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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