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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba535c14600c33afd50196daf010f63be3543ef4ef76323a8cb8e4f7afbebd2' 
  AND token = 'FgHOwphHb+JyU7JBgbkg1i2nepwanRQo6dvdqVHrBtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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