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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd31ff7869db97eec9eccd6d94069f414a8ae5e93506413cbaa3cc20b1d398d11' 
  AND token = 'ru1HpX0IqFqT7rqjHKS7ApNexNAbke8AoJWEkXhTaHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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