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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf0102e92ec977cf07be17cb0bf71432361c5c9194e900468062f8cd6caaa8b9' 
  AND token = 'TjlaHcYImBkl/rTYr7g8/zsTCNlkqmJh2QzPclWtmH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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