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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a03b0a26768f231248c354e77496e450cd10ae1c5cf751b31e687a872b22a4' 
  AND token = 'IEqA/6YIiKNAnqh/IIRcKtXPXie1td+wOAMDa4qL2I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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