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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8f2f04aafb8d77debe30d79ae7dfe8171c84cf10642e443901e5f88e62b8e4a' 
  AND token = '16xGp22/M7PeLt4KCHLc1OsjSGulWNlP9Tcl7XPzutw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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