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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c095b97f53e2b5697ace7ba39415cf7f7a8bb5c4255e183fcf84d6dc5a3f6f2a' 
  AND token = 'a70d6IAdNBFr8D+z3NKrcJuryFnd24kj8OlKDl18qeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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