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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c3da95d9d6d0580e59d22b8167fcb9e6582bb6978243433e33f36921dcd1e9' 
  AND token = '+ogLXpz/3BbOvUXDBtBaN7tTzI03wWkjIDNBv28wBKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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