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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a3fe449d612de1e732ee12ac5a37aa7ff1e4cef19b12d47368e250b07391cb' 
  AND token = 'E3mUVg7H4KDMQMai/hebS7j+Ev/2u3ohj/q8xFarM1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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