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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35405665c7e499dd50878a66d5fdb36d96be70097cdab4ebc9486164dff3ca56' 
  AND token = 'eNmDnre1hpcI6WcSqMgv6g6ewqqcHSHbE8AbFjjwHro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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