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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58767868edb6d2dd2c9167cbed089e4abe4d0dae270e917970dbe6da2943ed88' 
  AND token = 'e3QDLBJ+bTzdL4iH0UIhccrwJubIr0Yd72CxRkXuaKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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