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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c67e318aee7bfbc3e08147fa59892af4eef852b668200abf9376fbca293dbcc' 
  AND token = 'tg4reGlupYIfk/z73XGw4S1VUeY7VBZGr8yh2svrPB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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