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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d78d6367d019d0596094062d9fceae4e57b91f3c8583c4742a4ab543e397d1' 
  AND token = 'ehT3dGFl4s5oV2DTCBhGQlzhE7rFxC/tZZtQIRlHn08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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