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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3809cc595b6b706596855ee508ae36ba60479b51597238a8376c5203abe9f960' 
  AND token = 'GO8Y94wGlb2R9k//Oovc2Q7nouchVDpyCa5W38uSf28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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