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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '479ae6ae85398a1630a754bfe26aab3a39888ebf32357bda02217c24884e36b8' 
  AND token = 'hYAOe8pTXXMunyGrIOe+Wt0/79Fskjx/UFpY9SU5UxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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