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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd9e1c9a5cca8c56420e39b2a6e3c3ab93cbc71dac85472fbcb6b571dce945d' 
  AND token = 'VhGZ12NFAyTnl0NzYgchb1LISRUnV7qId48DdSyzlo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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