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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2330ee501c636d210df6c00db799363ef7f2e142473072d9df64759ab6ba537c' 
  AND token = '7CG9o553QlaUxFehPJT8nHJUH/h0WLKE3bHrMh2fVJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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