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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8f564c0a73411f6564254b367c9e378a28bc93b338199e137c0866500c6145f' 
  AND token = 'LP8ni/dBQQZDkYezoL4mS2Bl25B5PJbK3T2ynxG7dWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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