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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aad114742d4371c191bbb646564a24fff2f509c7c5fbcd5137d529ae31a392a1' 
  AND token = 'WTSNObFiLIxKb1Sl9045PsFVQ43BEkCNvbatU6yWUzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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