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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27f26f03664343a8ce155262424ae9c397205ef8384e77a3f48a0ead2bb30ae9' 
  AND token = 'Ume/zgsflH9qiM4i5EqkA49UbCvzeyyARJk5vY65RA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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