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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9becadb62d26e2ca79812b0d9e0b77040d78d455123e722ac98d49d9905b1632' 
  AND token = 'ZZTmhRFFsjMdKaVsYfl7HRa3E0urT/o+zaQa6zorqU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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