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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82738a27ba5827b5de908217476f32fbf12924e8cc9d148a42fb7e9f1e0d6f2d' 
  AND token = 'fQvjVchgAhPLep0di5tNKytc1e+lEcWegEQWuDBcR/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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