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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e07b0e837f101207f1f515aa7e3dc5e50a44accc6279b340063bbc115f35162e' 
  AND token = 'L6KuSHsO97/cTifs9Ip1PFk4wOSLCmer1msMQIHf9ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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