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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c996aaa357506d0aceb3d0e4d0f7cd83c34c3c11f0ea3793708aacc731afdc' 
  AND token = '2a+6VyPaycy0U7CWys2KmabJXK/oHne4vU77TCx+hJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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