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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9757fec62591ae3bb599bfb9c4d202d525e0479b8bb84669e339c0562f45a98a' 
  AND token = 'Y1Ho5qZfuPZrKbKbJ6wxbevNctGgANk3dKansxfGRlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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