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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd58b870b3c382b3292184ce4997c55c9b8bd8fc12479cb70788d784c984bb2a9' 
  AND token = '79/uEhMYkHed2aUF/FIsWki6apcyxZ6XAElE8HWrJcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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