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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fe0fb502922fa49840e3d8fb31a077c0043f53a09049482813b5ae80be88081' 
  AND token = 'x64ncaX99lx1N8KSXO4KfJTi1p5zXDsev7JaLcR8RZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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