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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '309c4f4cd54e490f3ad35ead4b57c3c315844000f85653fd9035000493fae8c0' 
  AND token = 'KbT/fg6JiI4UM2/F9V5AsZ/LQzJsiGYJXln1dps/7ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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