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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cf13b39f8b0da4a3f6d904aaaadcb98fc4c0ca186f6586e7ac487bceccf753d' 
  AND token = 'ZGuJ9xRP8v5arL10bfsBwqYnIhs5mgiesGWWd6o0krM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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