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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e4bba9311e553c4d60ceaedba40d1f59926a3a8900e33df858fe7de3d4531e5' 
  AND token = '9Vx2wcoFFALFGT8od9cztdHo+oEMGi4iCz0altyBbaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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