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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '507131cf838f641910f5fec0e6777b0fdf3832151de81cb107ca5e7d839dce82' 
  AND token = 'kqje980s20VV3zQVO67XSI5EMy8ZAqY8Q2AFZTT2g5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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