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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc70ce9bdb05889438851ba92864bb284074063bfb7bdf7daba1677c4b3c3cce' 
  AND token = 'WSuXAaxdDnW0uqrCDYDn1gGx0rr09pouoMcRCFhmK1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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