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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70abcfa5c5688c0c4b1e3a4761eb3c7007f280bed79d99c469d55a26f6576fd' 
  AND token = 'jcY/qXS6a16627YNx+aiQemFt0IBphsRL1T4rcmV+JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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