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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f2b07f37948fc20497c6360faccea965708a57788862e0997282601e910544' 
  AND token = '0F39e8vXqU/RtTrpt/Wp6yAFU8J8lURNxPNc9K77rZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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