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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd612790dd613f142e6430fb42c3e6d6f652aad18f650a871aad4df974893f7f' 
  AND token = 'f7L8p8FcVcIDl+ydjql74iv2WsHLhgMCCjksqbqdYaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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