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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3691a2a7630f17c066bb2d5cabdc0606db869ce154fb5a55d964df8c7e74e1b3' 
  AND token = 'I69QNXgEYCHdgCT8hjhKmwdfxTIAdZo6JWbZuT2ZlYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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