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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0d543d83b603db1b24f6666b4c8e3991f8259d91974d276af45d587f74644c9' 
  AND token = 'EuAP5GbJ5+JdfPdPlPOb7GerHOvJjIQuBHX1q+3pbqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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