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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d8ea3eec9702c97b05e7902a6b8b21b1de4736ee28b5b39c87573d4de44cdf4' 
  AND token = 'gQbJko5PdeIb4JOoYukVEbmg/SAzBfU5gypOZtjJzjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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