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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0575e2ed2e60a3572add5035b0a8b7f5dc64097b5a3501521fa63f2abfbbb98' 
  AND token = 'uMGYVT6eyKQaIYro18MAovlw/vT0wDkG/v19hL9lvCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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