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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab53246c561d530c4bc69e329e654bc05c388bbe433bcd3217cc777b520859ad' 
  AND token = 'rRFGPEgpJ0cLQMLKfdH3bAHCus2Z8KVBFymRW8GLklw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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