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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a6f9b3bc0c4a5128038f32ae8c0f68aceea6c116e8fcd1832877c0e8db39099' 
  AND token = '2HYUarxfIFhyMLkM1s+8jsQeSMN1GBVeX74ylv6BZ94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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