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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3b60ffaa0da1f9f72024c09e126fb4ba056e52c1d927ae45852402447600409' 
  AND token = 'WjuY51d2Ca2I5ddBdPQiQ4JHPz6r1OP7a2+nzItZl0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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