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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47885cc18c89bbd69b5a9a16a4b0ae70c47d8a8dd1f7fa81f130dc7639e17bf8' 
  AND token = 'vMb/LOUtdpf/D1Ps9XnF1p/WG8IWdQNP2THTksyJksk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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